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Patented Oct. 6, 1942 SEPARATION OF FELDSPAR FROM QUARTZ Robert Gibson OMeara, Tuscaloosa, Ala., assignor to the Government of the United States of America, as represented by the Secretary of the Interior No Drawing. Application April 5, 1940,.
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Feldspar acid separation quartz flotation Prior art date 1940-04-05 Legal status The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed. Expired - Lifetime Application number US328083A Inventor Omeara Robert Gibson Original
This invention relates to the preparation of ores for separation by froth flotation andor agglomerate table concentration film flotation or similar methods of concentration and particularly to the beneflciation of feldspar ores and their products. The invention is especially applicable to the froth flotation andor table concentration of feldspar from quartz and the separation of feldspar from other associated minerals. It is a continuation in part of application Serial Number 117,470.
In application of the present invention, great flexibility is achievable, as is particularly desirous in view of the wide variation in ores encountered. Thus by this invention the various feldspars can be floated andor tabled from the quartz in mixtures of various proportions. In addition, the feldspar can be separated from some of the other commonly associated gangue minerals such as mice. and garnet by modifying the procedure.
The39separation according to this invention is not based upon the same properties as any of the methods of beneflciation commonly used in the feldspar industry. In continuance of experimentation on the flotation of quartz from feldspar set-forth in a previous patent application, Ser. No. 117,470, it was discovered that changing from hydrochloric acid to hydrofluoric acid as a modifying agent reversed the order of flotation.
In this case the feldspar was floated from the quartz. A feed too coarse for flotation, but prepared in the same manner as for flotation also was separated on a concentrating table. The feldspar agglomerated or filmed over the side of the table and the quartz was carried out by the rifiles to the end of the table. In this case the separation was not39based on the specific gravity of the quartz and feldspar but upon the surface preparation. The feldspar was rendered waterrepellant as in flotation, and filmed whereas the quartz remained wetted by water.
In practicing the preparation of the ore according to this invention, it is desirable that the product be reasonably fine grained and that the mineralogical constituents be liberated. The ground ore is mixed with water forming a pulp or slurry tov which is added the necessary reagents. The pulp is conditioned to insure mixing, and the separation is effected on any of the well known types of flotation machines andr concentrating tables.
For the purpose of illustrating this invention, two examples are here given. comprising applications which have been made of these inventions to feldspar bearing products 1 in which the feldspars were prepared and separated from the quartz by froth flotation and 2 in which the feldspars were prepared and separated from the quartz by table concentration.
The feldspar ore consisted of plagioclase fe df spar. albite and oligoclase. potash feldspar, microcline and orthoclase. quartz and minor amounts of mica. The ore was ground through 20 mesh for liberation of the constituents and sized on 48 mesh. The plus 48 mesh size was prepared and separated on a concentrating table. and the minus 48-mesh material was prepared and separated by flotation.
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